Crow mcgee

: I recently posted a request for information about the American expression "crow mcgee" and received some very helpful and interesting replies. I wish to thank those individuals for their help while requesting more information.
: The expression is quoted in some (rare) dictionaries, but what about it's real use?
: It is supposed to mean: no good, unreal, false (
), but what about it's actual use? Do you use it or hear it used? Is it just prison slang?